synergistic research orange blue fuse direction.

 There are at least two ways to decide which side is the hot side. One is to buy an inexpensive circuit tester screwdriver. When touching a hot connection the screwdriver will exhibit a bright light. The less reliable method is to look at the equipment and trace the direction the current flows.

This sort of info, is extremely dangerous to ask a gullible or non qualified technician to do, and it should be deleted, some one, one day will get hurt or worse.

@guyt The easiest way is to simply test the sound quality in each direction. As others have stated, this doesn’t take long at all, the fuse doesn’t need to be fully broken in, and the preference will be clear to you.

+1 to @davidpritchard for his very helpful post, copied below:

I have tested the basic ceramic fuse that comes stock in the Pass Labs amplifiers that use a fuse. The fuse does exhibit directionally, but it is not a striking difference. The audiophile fuses I have tried have a greater change in sound depending in the direction they are installed.

The Synergistic Research Blue and Orange fuses should be installed with the "S" closest to the hot side of the fuse holder and the "R" closest to the Neutral side of the fuse holder. There are at least two ways to decide which side is the hot side. One is to buy an inexpensive circuit tester screwdriver. When touching a hot connection the screwdriver will exhibit a bright light. The less reliable method is to look at the equipment and trace the direction the current flows. This is straight forward when the fuse is located as part of the inlet for the power cord. Easy to see which side is Hot and which side is neutral. At other fuse locations current direction may not be obvious.The "S" of the Synergistic Research label should be closest to the Hot side.

Of course the other approach is to just listen to music (thirty seconds is plenty) , and keep the fuse in place where the sound is better. This can be done on first installation. You do not need to break in a fuse for 10 days and then test for optimum direction. I have done that rather tedious experiment. No need to repeat that approach.


David Pritchard

Thanks to you all for your input.  The S and R on the fuse is located on one end of the fuse. So correct me if I am wrong it is not the vertical rotation of the fuse outside the fuse  receptacle and reinsertion of the fuse,  but the  rotation of the fuse on the horizontal plane while the fuse is in the holder.  Please advise.

Thank you

So correct me if I am wrong it is not the vertical rotation of the fuse outside the fuse receptacle and reinsertion of the fuse, but the rotation of the fuse on the horizontal plane while the fuse is in the holder. Please advise.

Thank you

Short of sticking your finger in there to see which side kills you, you will never find out which side is live, unless you are a technician with an ac voltage multimeter and have the knowledge on how to use it. And BTW!!! AC mains is non directional anyway!!!
So return them and get your $600 back, and put back the $1 worth of fuses you took out, before the return time runs out!!!.

Cheers George

George, shouldn't you be out saving Koalas? : )